feat: add chainlist integration

Cargo.toml

@@ -8,6 +8,7 @@ alloy = { version = "0.1.4", features = ["full"] }
 alloy-primitives = "0.7.7"
 anyhow = "1.0.86"
 dirs = "5.0.1"
+reqwest = "0.12.9"
 serde = "1.0.204"
 serde_json = "1.0.120"
 structopt = "0.3.26"

shell.nix

@@ -4,6 +4,8 @@ pkgs.mkShell {
   inputsFrom = [(pkgs.callPackage ./default.nix {})];
   # Additional tooling
   buildInputs = with pkgs; [
+    openssl
+    pkg-config
     rust-analyzer # LSP Server
     rustfmt # Formatter
     clippy # Linter

src/chainlist.rs

@@ -0,0 +1,31 @@
+use anyhow::{anyhow, Result};
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+pub struct ChainlistEntry {
+    pub name: String,
+    #[serde(rename = "chainId")]
+    pub chain_id: u64,
+    pub rpc: Vec<String>,
+}
+
+pub async fn fetch_chain_data(
+    chain_id: Option<u64>,
+    name: Option<String>,
+) -> Result<ChainlistEntry> {
+    let url = "https://chainid.network/chains.json";
+    let chains: Vec<ChainlistEntry> = reqwest::get(url).await?.json().await?;
+
+    let chain = if let Some(id) = chain_id {
+        chains.into_iter().find(|c| c.chain_id == id)
+    } else if let Some(name) = name {
+        let name_lower = name.to_lowercase();
+        chains
+            .into_iter()
+            .find(|c| c.name.to_lowercase() == name_lower)
+    } else {
+        None
+    };
+
+    chain.ok_or_else(|| anyhow!("Chain not found in chainlist"))
+}